Portion of a display screen showing a transitional user interface



FIG. 1 illustrates a first state of a transitional user interface showing the new design.

FIG. 2 illustrates a second state thereof.

FIG. 3 illustrates a third state thereof; and,

FIG. 4 illustrates a fourth state thereof.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1–4. The process or period in which one image transitions to another image forms no part of the claimed design. The broken lines in the Figure represent unclaimed features and form no part of the claimed design. The broken lines illustrating a portion of a display screen are for illustrative purposes only and form no part of the claimed design. The broken lines illustrating “CONTENT” are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portion of a display screen showing a transitional user interface, as shown and described. 